Visual agnosia; Classification by three types and responsible area for each

  • Ota Hisaaki
    Division of rehabilitation, Sapporo Medical University Hospital.

Bibliographic Information

Other Title
  • 視覚失認―3つのタイプによる症状区分とそれぞれの責任領域について―
  • ─3 つのタイプによる症状区分とそれぞれの責任領域について─

Abstract

Visual agnostic symptom is classically divided into two types ; apperceptive and associative type. Based on pathological visual form information process, the term of integrative type had been added to those two classical types and new classification by three types was recently proposed. Lesion analyses leveled that the bilateral medial occipital cortices are responsible for apperceptive type. Integrative and associative types are related to damage in the medial temporo-occipital cortex though it is not clear yet which part in this area is responsible for each type. Results of brain imaging studies, however, showed that activation in the lateral occipital cortex during visual form processing task. Putting together these clinical and experimental findings, it may be possible to account for those three types in terms of visual processing neural route as follows ; apperceptive visual agnosia could occur if visual information process from the medial to the lateral occipital cortex is severely damaged. If this route works partially, visual agnosia could be regarded as integrative type. Damaged in the following rostral route but not in the lateral and the medial occipital area, the symptom could be associative type. Thus by suggesting the neural route for visual form information, responsible area for each of three types of visual agnosia was explained theoretically.

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Details 詳細情報について

  • CRID
    1390282680180649216
  • NII Article ID
    130004467644
  • DOI
    10.2496/hbfr.30.271
  • ISSN
    18806554
    13484818
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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